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MrRa [10]
2 years ago
7

Which of the following is NOT an example of an exact number?

Chemistry
2 answers:
Mashcka [7]2 years ago
6 0

Answer:

The desk is 84 cm long

Explanation:

Exact numbers are either defined numbers or the result of a count

hope it helps!

klemol [59]2 years ago
5 0

Answer:

the desk is 84 cm long

Explanation:

A hexagon always have 6 sides.

A tricycle always have 3 wheels. That's why it's called tri

A tables Always have 4 legs. Well in most cases.

But a desk is not always 84 cm

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Y_Kistochka [10]
I think i wrote it already
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4 0
3 years ago
Process of loss of electron is called
myrzilka [38]
Oxidation is basically lose of electron..

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3 years ago
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A binary compound created by reaction of nitrogen and an unknown element E contains 30.46% N and 69.54% E by mass. If the formul
aleksklad [387]

Answer:

15.95

Explanation:

This question is a modification of the calculation of  the empirical formula of a compound given its percent composition and atomic weights of the elements in the compound.

Here we are given the formula and the percent composition, so we know that there are 4 atoms of E per 2 atoms of N so lets solve using the information given.

In 100 grams of the binary compound we have

30.46 g N

69.54 g E

The number of moles is the mass divided by atomic weight:

mol N = 30.46 g / A.W N = 30.46 g / 14.00 g/mol = 2.18 mol N

mol E = 65.54 g / A.W E

Thus,

4 mol E/ 2 mol N = ( 69.54 g/ A.W E ) / 2.18

2  A.E = 65.54 g / 2.18  ⇒ A.W E = 69.54 g / ( 2 x 2.18 ) = 15.94 g

So the A.W is 15.94 g/mol which is close  the atomic weight of O.

5 0
3 years ago
Heating chemicals is defined by the process of combustion.<br> A. True<br> B. False
padilas [110]
Answer: A. True

Explanation: Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is called the fuel, and the source of oxygen is called the oxidizer. ... During combustion, new chemical substances are created from the fuel and the oxidizer.
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5. Every organism has a set of instructions that
Goryan [66]

Answer: b. heredity

Explanation:

6 0
3 years ago
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